Speaker: Swapan Chakrabarti (University of Calcutta)
Title: Phosphorescence: How Theory Meets Experiments
In the first part, I will show you how often the experimentalists misinterpret the
phosphorescence spectra and the corresponding lifetimes. The talk will cover two
important aspects, namely ultralong lifetime of pure organic phosphor and violation
of Kasha's rule in a white light emitting diode. The results related to vibronic
contribution up to Herzberg-Teller term will be presented. In the second part, I will
discuss second order cumulant based time dependent method for calculating
intersystem crossing rate. The method includes explicit role of Duschinsky rotation
as well. To verify the robustness of this method, we have applied it to elucidate the
dual emission and pure phosphorescence from a class of platinum complexes.
Reference:
- On the Origin of Dual Peak Phosphorescence and Ultralong Lifetime of 4,6-Diethoxy-2-carbazolyl-1,3,5-triazine, Lopa Paul, Swapan Chakrabarti, and Kenneth Ruud J. Phys. Chem. Lett. 8, 1253 (2017)
- Anomalous Phosphorescence from an Organometallic White-Light Phosphor, Lopa Paul, Swapan Chakrabarti, and Kenneth Ruud J. Phys. Chem. Lett. 8, 4893 (2017)
- Unraveling the Microscopic Origin of Triplet Lasing from Organic Solids, Lopa Paul, Ambar Banerjee, Ankan Paul, Kenneth Ruud, and Swapan Chakrabarti J. Phys. Chem. Lett., 9, 4314 (2018)
- Intersystem crossing rate dependent dual emission and phosphorescence from cyclometalated platinum complexes: A second order cumulant expansion based approach, Torsha Moitra, Md. Mehboob Alam, and Swapan Chakrabarti Phys. Chem. Chem. Phys., accepted (2018)
The Hylleraas seminars alternate between Oslo (room V205) and Tromsø (room C329), and are broadcasted by video conference to the other place. It is possible to follow the seminars externally upon request.